Fiendlash, Screaming Nemesis, and With Great Power...

Prerequisites

• Fiendlash on the battlefield
• Screaming Nemesis on the battlefield
• With Great Power
• on the battlefield

Steps

1. Deal damage to Screaming Nemesis
2. Screaming Nemesis and Fiendlash trigger
3. Resolve the Screaming Nemesis trigger, dealing damage to an applicable target
4. Resolve the Fiendlash trigger, targeting you, but dealing damage to Screaming Nemesis instead due to With Great Power
5. Repeat from step 2

Results

• Infinite damage